Assume the following code is executed on the PIPE machine that does forwarding 0

Question

Assume the following code is executed on the PIPE machine that does forwarding 0x000: 0x000: 30f65800000000000000 | 0x00a: 30f76000000000000000 | 0x014: 50660000000000000000 I 0x01e: 50770000000000000000 I 0x028: 6176 0x02a: 724600000000000000 0x033: 30f00000000000000000 | 0x03d: 705000000000000000 0x046: 30f00100000000000000 1 less: irmovg $1, %rax 0x050: 00 0x058: 0x058: 0c000000000 0x060: 0800000000000000 num2: quad 8 -pos 0 irmovq num1 , %rsi irmovq num2, %rdi mrmovq (ers), %rsi mrmovq (%rdi), %rdi subq %rdi, %rsi ji less irmovq $0, %rax jmp done I done: halt .align 8 00000 numl: quad 12 What instruction is fetched after the 0x02a: 724600000000000000 j less Select one: 0x050: 00 | done: halt 0x03d: 705000000000000000 jmp done C. 0x033: 30f00000000000000000 I irmovq $0, %rax 0x046: 30f00 100000000000000 | less: irmovq $1, %rax

Explanation / Answer

Answer: Option: C irmovq $0, %rax

Explanation:

The values in %rsi and %rdi are 0c00.... and 0800.... Respectively

The result for subq %rsi, %rdi will be positive will not update the negative flag

Therefore jl less is not executed, in which PC points to next instruction

So the next instruction that is executed after jl jess is

irmovq $0, %rax.

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